Method for connecting mobile station to base station, mobile station, base station, multi-carrier mobile communication system, and random access channel mapping method

ES 2 398 720 T3

DESCRIPTION

Method of connecting a mobile station to a base station

Technical field

The present invention relates to a method of processing the connection between a mobile station and a base station.

Technical background

Currently, as radio access technology (RAT), which is a radio access technology, wideband code division multiple access (W-CDMA) has been standardized, document Non-patent 1) regulated by the 3rd Generation Partnership Project (3GPP) as a 3rd generation cellular mobile communication method, and the service that uses it has been launched.

In addition, the evolved universal terrestrial radio access (evolution of the third generation RAT, hereinafter called EUTRA (evolved universal terrestrial radio access)) and the evolved universal terrestrial radio access network (evolution of the evolved terrestrial radio access network) have been analyzed. third generation, hereinafter called EUTRAN (evolved universal terrestrial radio access network). For EUTRA, orthogonal frequency division multiplexing access (OFDMA) has been proposed as a communication method (non-patent document 2).

EUTRA, which is a next generation communication standard, is based on third generation (3G) technology and uses OFDM or similar to achieve higher capacity and higher speed in mobile communication. Although it is assumed that 3G technology is basically built-in, there are, on the other hand, many problems that must but cannot be solved by 3G technology.

An uplink Random Access Channel (RACH) sequence, in an uplink in EUTRA, is an important procedure for a mobile station and a base station in performing the connection process between the two (for example, its importance is pointed out in non-patent document 3). However, the procedure or the meaning of it differs greatly in 3G technology and in the EUTRA standard.

That is, according to 3G technology, a random access channel (RACH: a channel that allows a mobile station to transmit to a base station at an arbitrary timing, and is used to establish an uplink) is not orthogonal to a data channel and therefore there may be a case where interference occurs between the RACH and the data channel. Therefore, what is called a power ramp is required, so that the transmit power is gradually increased on the mobile station side until the base station can receive data (for example, refer to pages 45 at 47, 2-2-3 Random access, in non-patent document 1, mentioned above).

In this case, the uplink random access by the W-CDMA method will be briefly explained using Fig. 22. Fig. 22 is a flow chart showing the uplink random access procedures by the W-CDMA method.

For a mobile station that carries out the initial transmission, that is, a mobile station immediately after its power is turned on or a mobile station that receives data intermittently, it is necessary to transmit a random access channel (RACH ) to a base station, before establishing an uplink to the base station. Because the RACH is used before the respective uplink resource is allocated, there is a case where the transmission frequency and timing of the RACH are the same as that of another mobile station. At this time, due to a transmission signal degraded due to interference between stations, the base station may not receive the RACH correctly.

Therefore, as shown in Fig. 22, first the mobile station randomly selects a data signal row specifying a transmitting mobile station, called the RACH preamble, and transmits it to the base station (step S20) . If the base station returns an acknowledgment (ACK) indicating a transmission permission in response to the RACH preamble (step S21), the actual data transmission called RACH message is started (step S22). On the other hand, in a case where ACK is not returned from the base station (step S21) or no acknowledgment (NACK) is returned, the transmission power of the RACH preamble is increased (step S25) and is carried out accordingly. again the transmission of the RACH preamble. The same process is repeated while checking whether the predetermined number of retransmissions has been reached (step S23). If ACK cannot be received from the station

ES 2 398 720 T3 base even after the predetermined number of transmissions has elapsed, it is estimated that the RACH transmission has failed (step S24) and the process ends.

On the other hand, in a mobile communication method that uses OFDM (EUTRA method), because the RACH is orthogonal to a data channel, there is basically no interference between both sides, and therefore the ramp is not required. of power described above.

However, instead of this, in OFDM communication a correction of the transmission timing of the mobile station is required, which takes into account the influence of multipath (process for establishing time synchronization as a function of correction information). transmission timing from the base station) and a process of allocating a communication resource by scheduling at the base station. These processes are unique to an OFDM use case, and 3G technology cannot be incorporated. Therefore, a new technology of the connection process between a mobile station and a base station is required.

Non-patent document number 1: Tachikawa, K., 2001, W-CDMA Mobile Communication Method: Maruzen Co., Ltd. Non-patent document number 2: 3GPP TR (technical report) 25,814, V1.4.1 (2006-5) , Physical Layer Aspects for Evolved UTRA, http://www.3gpp.org/ftp/Specs/html-info/25814.htm. Non-patent document number 3: Ericsson, E-UTRA Random Access, 3GPP TSG RAN WG1 43rd meeting, Seoul, Korea, November 7-11, 2005.

3GPP TR 25.814 V1.5.0, 27, May 2006, is a newer version of non-patent document number 2.

Disclosure of the invention

Problem to be solved by the invention

In the process of connecting on an uplink line to allow data transmission between a mobile station and a base station in the EUTRA, there is no regulation on what type of channel is to be used. Especially, the state of a mobile station in relation to a base station can always be changed, and therefore, without clarifying which communication channel is used in which case, a connection process cannot be carried out.

Furthermore, a transmission process from a mobile station to a base station or from a base station to a mobile station is not uniformly configured. For example, there is a case where each of two types of information (for example, uplink synchronization request and resource allocation request, transmitted by a mobile station to a base station) can be transmitted using respective sequences, or the two types of information can be transmitted simultaneously (in parallel). Therefore, in order to flexibly correspond to said transmission variation, a discussion about the contents of the connection process is important.

In addition, in the connection process on the uplink line, according to the EUTRA standard, it is important to increase the efficiency of use of OFDM communication resources, and avoid wasting a resource that can be used for data communication or other. similar function carried out simultaneously and in parallel. Especially, it is an important question how a synchronous RACH / asynchronous RACH is mapped to a communication resource.

The present invention has been made taking the foregoing into account and is aimed at achieving a new connection process between a mobile station and a base station that can flexibly correspond to the actual state of the mobile station or to the variation of the current transmission procedure, that you can efficiently use a communication resource and follow the EUTRA standard.

Summary of the invention

The present invention discloses a method as defined by independent claim 1. It should also be noted that the description discloses a number of so-called embodiments which, however, do not form part of the invention. In particular, those that explain the use of a synchronous RACH.

Brief description of the drawings

[Figure 1] A view to explain the resource allocation of a line according to the EUTRA standard (using OFDM).

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[Figure 2] A view showing an example of resource mapping in a downlink line, according to the EUTRA standard (using OFDM).

[Figure 3] A view showing an example of resource mapping on an uplink line, according to the EUTRA standard (using OFDM).

[Figure 4] A sequence diagram showing an example of a RACH sequence (an example in which transmission timing information and resource information are transmitted simultaneously using different sequences), according to the EUTRA standard.

[Figure 5] A sequence diagram showing another example of RACH sequence (an example in which transmission timing information and resource information are transmitted simultaneously), according to the EUTRA standard.

[Figure 6] A view showing an example of mapping an asynchronous RACH to a resource unit, in a radio frame.

[Figure 7] A view showing an example of mapping a synchronous RACH to a resource unit in a radio frame.

[Figure 8] A view in which seven embodiments of the present invention are classified, by a usable channel and a resource request method.

[Figure 9] A block diagram showing an example of a mobile station configuration.

[Figure 10] A block diagram showing an example of a base station configuration.

[Figure 11] A view showing an example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 12] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 13] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 14] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 15] A view showing a channel example mapping a synchronous RACH / asynchronous RACH (an example where each of the asynchronous RACH and the synchronous RACH are provided in different TTIs).

[Figure 16] A view showing another channel example mapping a synchronous RACH / asynchronous RACH (an example where each of the asynchronous RACH and the synchronous RACH is provided in a common TTI with different frequency band).

[Figure 17] A view showing another channel example mapping a synchronous / asynchronous RACH (an example where the asynchronous RACH is mapped across the entire frequency band of a TTI and the synchronous RACH is provided so that it is dispersed on a frequency axis with a frequency band of a resource unit as a unit, and is homogeneously shared in time on a temporal axis).

[Figure 18] A view showing another channel example mapping a synchronous / asynchronous RACH (an example where each of the asynchronous RACH and synchronous RACH are provided by sharing a common TTI and frequency band).

[Figure 19] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 20] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

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[Figure 21] A view showing another example of a series of processes (and contents) of the uplink connection process between a mobile station and a base station.

[Figure 22] A flow chart showing a random access procedure (RACH transmission procedure) on an uplink line in a W-CDMA method.

Reception section

Channel demodulation section

Control signal analysis section

Decoding section

Channel measurement section

Transmission section

Channel modulation section

Coding section

Planning section

Transmission timing adjustment section

Control section (top layer)

Mobile station

Base station

Reception section

Channel detection section

Planning section

Transmission timing information generation section

DSCCH generation section

Transmission section

AN1, AN2, AN3, AN4 Antenna

Best mode of carrying out the claimed invention

Before providing a detailed explanation of an embodiment, a general summary of the technique adopted by EUTRA and the basic technical content that the present invention follows will be briefly explained.

Figure 1 is a view to explain resource allocation according to the EUTRA standard (using OFDM). As shown in the figure, a EUTRA radio frame is regulated by a time axis and a frequency axis. A frequency band that can be used corresponds to a frequency band occupied by all the subcarriers. The radio frame is then divided into a series of resource blocks RB (hereinafter referred to as RB) on the downlink line. The resource block (RB) is a unit used when a base station allocates a communication resource to the mobile station present in the same cell. The resource block (RB) is regulated by a predetermined frequency bandwidth (Bch) and a sub-frame interval on the time axis (transmission timing interval: hereinafter called TTI. TTI is equivalent to a sub-frame period) . In this case, the resource block (RB) is called a resource unit (hereinafter, it can be called as RB) on a link line

ES 2 398 720 T3 ascending. Therefore, in the present application, the term resource block (RB) will be used for the downlink line and the term resource unit (RU) will be used for the uplink line.

Fig. 2 is a view showing an example of resource mapping in the downlink line, according to the EUTRA standard (using OFDM). BW indicates a frequency bandwidth and Bch indicates a frequency bandwidth of a resource block (RB). In Figure 2, a resource block (RB) is assigned to each from mobile station 1 (MS1) to mobile station 4 (MS4). In addition, a downlink common pilot channel (D-CPICH), a downlink shared control channel (DSCCH), and a downlink shared data channel (DSDCH) are used. downlink shared data channel).

In this case, the downlink common pilot channel (D-CPICH) is a channel used to measure the quality of the downlink radio link. In addition, the downlink shared control channel (DSCCH) is a channel used to report transmit power control, received data modulation method, scheduling information, or the like. Furthermore, the downlink shared data channel (DSDCH) is a channel used for the transmission of downlink user data. In this case, even if the downlink channel mapping configuration differs from the present figure, such difference does not influence the present invention at all. For example, a mapping configuration in which the DSCCH is included in the DSDCH is acceptable.

Fig. 3 is a view showing an example of resource mapping in an uplink line according to the EUTRA standard (using OFDM). In Figure 3, analogously to Figure 2, a resource unit (RU) is assigned to each station from mobile station 1 (MS1) to mobile station 4 (MS4) provided in a cell managed by the base station.

In Figure 3, an Uplink Shared Control Channel (USCCH) is used to notify the base station of the CQI (Quality Information Index) of a downlink data channel, HARQ, ACK / NACK, information regarding transmission data and the like.

An uplink common pilot channel (U-CPICH) is a channel used to take over the quality of the uplink radio path. An uplink shared data channel (USDCH) is a channel used to transmit uplink user data.

Furthermore, a random access channel (RACH) is a channel used by a mobile station to carry out an uplink resource allocation request when transmission is initiated.

In the present example, an example is shown where a RACH is assigned to the entire frequency band (BW) in a TTI (in the figure, TTI 3). However, multiple RACHs can be assigned to an arbitrary Resource Unit (RU) or they can be assigned to an arbitrary subframe interval. In this case, if the mapping configuration of the uplink channel differs from the present figure, such difference has no influence on the present invention. For example, a mapping configuration in which the USCCH is included in the USDCH is acceptable.

Next, a variation of a RACH sequence according to the EUTRA standard will be explained. Fig. 4 is a sequence diagram showing an example of a RACH sequence in the EUTRA standard (an example in which transmission timing information and resource information are transmitted by a respective sequence). In Figure 4, the mobile station respectively transmits an RACH preamble and an uplink resource allocation request, and in response to this, the base station responds respectively with uplink transmission timing information (uplink correction information). transmission timing) and uplink resource allocation information (resource information).

In Fig. 4, in a case where uplink data transmission is generated in a mobile station to which no uplink resources have been assigned, the mobile station randomly selects a resource unit (RU) assigned as RACH , and transmits an RACH preamble in the selected resource unit (RU) (step S1). The base station receives the RACH preamble, calculates the difference in the mobile station's transmission timing from the currently received timing, and transmits to the mobile station (step S2) transmission timing correction information (transmission timing information). uplink transmission).

The mobile station adjusts the transmission timing by the correction information, and then transmits a transmission request (step S3). The transmission request is a request for the allocation of

ES 2 398 720 T3 uplink resources transmitted to the base station along with control information regarding the transmission data. In the present application, terms such as resource allocation request or transmission request are also used, but these terms all have the same meaning.

The base station carries out the planning of a necessary uplink resource, based on control information in the received transmission request, and transmits (step S4) to the mobile station the assigned uplink resource allocation information. according to planning.

By the above-mentioned procedures, synchronization is established on the uplink line and a resource is allocated for data transmission from the mobile station. Therefore, the mobile station uses the assigned uplink resource to initiate data transmission (step S5).

Fig. 5 is a sequence diagram showing another example of RACH sequence in the EUTRA standard (an example in which uplink timing information and uplink resource allocation information are transmitted simultaneously). In Fig. 5, in a case where uplink data is generated in a mobile station to which an uplink resource has not been assigned, the mobile station randomly selects a resource unit (RU) assigned as RACH, and carries out the transmission including a RACH preamble and a transmission request in the selected resource unit (RU) (step S10).

The base station receives the RACH preamble and transmission request, calculates the difference in the mobile station's transmission timing from the actual received timing, and transmits transmission timing correction information (transmission timing information from uplink) to the mobile station (step S1). Furthermore, the base station carries out the planning of a necessary uplink resource, from the information contained in the transmission request, and transmits to the mobile station (step S12) uplink resource allocation information, assigned depending on the planning. In this case, the transmission timing correction information (uplink transmission timing information) and the uplink resource allocation information can be transmitted simultaneously from the base station.

Next, the mobile station modifies the transmission timing using transmission timing correction information (uplink transmission timing information) and starts data transmission using the assigned uplink resource (step S13).

Furthermore, in the present invention, two types of random access channel are prepared, an asynchronous RACH and a synchronous RACH, which allow the mobile station to transmit at an arbitrary timing. Said RACHs are used selectively based on the actual state of the mobile station.

Asynchronous RACH / Synchronous RACH will be briefly explained below. The asynchronous RACH does not acquire uplink timing correction information from the base station, and is an RACH used in a state where the uplink timing is not corrected. On the other hand, the synchronous RACH is a RACH used in a state where the transmission timing is corrected.

Since RACH is originally a channel for a mobile station to transmit at an arbitrary timing to a base station, it is generally assumed that no time synchronization is established between the base station at this time (in the case of verbal communication , only this case can be assumed). However, in the case of packet data communication, there is a case where the RACH is transmitted from the mobile station to the base station in a state where time synchronization with the base station is established. For example, this case corresponds to one in which an uplink is established (the transmission timing difference is corrected) with the base station and then before the link disappears (as long as the timing difference correction is valid ) data transmission of a new uplink is required and the mobile station transmits RACH to the base station. In this case, for example, if the RACH is transmitted at the timing that matches the top of a frame on the synchronized link, the timing matches the base station receive timing. Therefore, in this case the RACH can be called a synchronous RACH.

The asynchronous RACH needs to establish a guard time (a redundant period that is an extension of a single code multiplied by the RACH) to reduce the influence of multipath when mapping data to a subcarrier and transmitting to the base station. However, the synchronous RACH does not need the guard time.

Therefore, efficient utilization of the synchronous RACH enables efficient utilization of a communication resource.

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Fig. 6 is a view showing a mapping example of an asynchronous RACH. As shown in the figure, the asynchronous RACH has guard time, and the asynchronous RACH including guard time occupies a subframe interval (TTI = 0.5 ms).

Fig. 7 is a view showing an example of mapping a synchronous RACH to a resource unit in a radio frame. As shown in the figure, since the synchronous RACH does not require guard time and synchronization is guaranteed, the minimum duration of the synchronous RACH matches the duration of the OFDM symbol. That is, since there is no redundant guard time, the duration is significantly reduced. Therefore, a free part of the subframe interval (TTI = 0.5 ms) can be assigned to a data channel or a control channel. If the synchronous RACH is used efficiently as mentioned, it becomes possible to use a communication resource efficiently.

Also, while the RACH is a channel used before the allocation of a resource (resource allocation request), there may be a case where it is necessary to transmit a request for a new resource allocation even after the allocation of a resource. resource. In such a case, it is conceivable that instead of the RACH, for example an uplink shared control channel USCCH (a channel for carrying out transmission using an allocated resource) could be used.

Next, in relation to the processing method of the present invention, apart from the synchronous RACH and the asynchronous RACH, a control channel is assumed that can be used in common by a number of mobile stations (for example, the control channel Uplink Shared (USCCH) corresponds to these) as a channel that has the possibility of being used in the uplink.

The USCCH is a channel for transmission with corrected transmission timing difference (uplink synchronized) that uses a resource allocated by the base station, and the mobile station can use this channel for transmission to the base station of a quality indicator channel (CQI), an automatic repeat request request (hybrid ARQ), ACK / NACK or the like. As mentioned above, it is assumed that there may be a case where a new resource allocation request is transmitted using the currently allocated resource and the uplink shared control channel (USCCH), if new data is generated. transmission after a resource is allocated from the base station. Therefore, the uplink shared control channel (US RACH) is also a channel that has the possibility to be used for the uplink connection process.

Therefore, as a result, the channels that have the possibility to be used for the uplink connection process include the asynchronous RACH and the synchronous RACH as channels used before the allocation of a resource, and a shared control channel of uplink (USCCH) as a channel used after resource allocation, with three channels in total. In this case, a specific name of the control channel usable in common is not specifically specified. However, in the following explanation and to facilitate it, the channel will be described as the uplink shared control channel (USCCH) (however, the channel is not limited to this and in case the use of another channel is allowed in EUTRA, this control channel can be used).

Furthermore, in the present invention, synchronous RACH, asynchronous RACH, and USCCH are used adaptively taking into account especially the resource utilization efficiency, the uplink resource allocation status in the mobile station and the status of time synchronization on the uplink. That is, the state of the mobile station at the time the transmission data is generated in the mobile station is classified according to whether there is time synchronization or there is allocation of a resource and, if necessary, it is classified according to the type of resource allocation request information that is transmitted from the mobile station to the base station (i.e. There may be a case in which, for classification purposes, the types of signal used to request planning information are taken into account because, as a request signal for resource planning information, a signal that notifies the existence can be used transmission data, a signal that reports the volume of transmission data, a signal that reports types and frequencies of transmission data, a signal that reports the volume of the transmit buffer or many other signals). Next, if transmission data is actually being generated in the mobile station, based on the state of the mobile station classified in this way, a channel is adaptively selected among the above three channels.

In other words, in the following embodiments, the actual situation of an OFDM mobile communication is specifically assumed, and the state of the environment in which the connection process is carried out is established. Then, according to the establishment of the state, the most appropriate channels for its use will be determined for the four cases mentioned above. The basic states established in the following embodiments are as follows:

(a) State model 1 (realizations 1 and 2)

ES 2 398 720 T3 (1) An uplink synchronization request signal and a resource allocation request signal can be transmitted simultaneously.

(2) Synchronous RACH is not used.

(3) USCCH can be used for resource allocation.

(d) State model 2 (Embodiment 3) (1) An uplink synchronization request signal and a resource allocation request signal cannot be simultaneously transmitted (respectively transmitted).

(2) USCCH is not used.

(3) Synchronous RACH can be used for resource allocation request.

(c) State model 3 (Embodiments 4 to 7) (1) An uplink synchronization request signal and a resource allocation request signal cannot be transmitted simultaneously (respectively transmitted).

(2) Synchronous RACH can be used for resource allocation request.

(3) USCCH can be used for resource allocation request. In this case, state model 3 is the most important state and based on state model 3, the basic uplink usage method will be as follows: Asynchronous RACH is used to request timing correction information. Also, in the case of a resource allocation request, USCCH is used when a resource exists and synchronous RACH is used when no resource exists.

Next, the classification of the contents shown will be briefly explained in the following explanation of embodiments (Embodiments 1 to 7). Figure 8 is a view in which the contents of each of the seven embodiments of the present invention are classified, by a usable channel and a resource request method.

In Fig. 8, each of the numbers (1) to (7) shown on the left side indicates embodiments 1 to 7, respectively. In the center, a usable channel is displayed for a resource request. Next, on the right is a resource request method (data type used for the request, or similar). See the following.

(1) In Embodiment 1, asynchronous RACH and USCCH are used, and a mobile station transmits to a base station information notifying whether or not there is transmission data, to carry out a resource allocation request.

(2) In Embodiment 2, asynchronous RACH and USCCH are used, and a mobile station transmits information reporting the data volume for the transmission data to a base station, in order to carry out a resource allocation request.

(3) In Embodiment 3, asynchronous RACH and synchronous RACH are used, and a mobile station transmits information reporting the data volume for the transmission data to a base station, in order to carry out a resource allocation request.

(4) In Embodiment 4, asynchronous RACH, synchronous RACH and USCCH are used, and a mobile station transmits to a base station information notifying the data volume for the transmission data, in order to carry out an allocation request of resource.

(5) In Embodiment 5, asynchronous RACH, synchronous RACH and USCCH are used, and a mobile station transmits to a base station information notifying the type of transmission data or a fixed transmission rate, to carry out a request for resource allocation.

(6) In Embodiment 6, asynchronous RACH, synchronous RACH and USCCH are used, and a mobile station transmits to a base station information notifying the type of transmission data or a variable transmission rate, to carry out a request for resource allocation.

ES 2 398 720 T3 (7) In embodiment 7, asynchronous RACH, synchronous RACH and USCCH are used, and a mobile station transmits the volume of the non-transmitted data buffer to a base station, in order to carry out a resource allocation request.

Furthermore, in the following embodiments, the status of the mobile station is classified based on the uplink sync / non-sync and whether or not there is uplink resource information, and it is considered and determined for each case which channel is the most appropriate. That is, in the present invention, the state in which a mobile station in EUTRA transmits a transmission request is classified into four: (1) no uplink resource information, asynchronous uplink, (2) no resource information uplink, synchronous uplink, (3) uplink resource information, asynchronous uplink and (4) uplink resource information, synchronous uplink.

In this case, no uplink resource information means a state in which the mobile station is not assigned an uplink resource for transmitting a transmission request by USCCH. For example, a waiting state in EUTRA corresponds to this state. Furthermore, this state corresponds to a case where the state is active and a mobile station starts the subsequent transmission before the state changes to the inactive state immediately after the completion of the transmission of certain transmission data (in this case, there is no resource for the newly generated streaming data).

On the other hand, uplink resource information exists means a state in which an uplink resource for transmitting a transmission request by USCCH has already been assigned to the mobile station. For example, this state corresponds to a case in which the adaptive allocation of a resource necessary for data transmission is required, due to a cause such as an increase / decrease in the transmission speed or in the volume of the transmission buffer. , in an active state in EUTRA.

Furthermore, asynchronous uplink means a state before a mobile station corrects the difference in transmission timing by correction information, or a state in which the mobile station does not receive the correction information for a predetermined period of time, so that the effective period of the correction information expires and the uplink is out of sync.

On the other hand, synchronous uplink is a state in which a mobile station corrects the difference in transmission timing by correction information, and the correction information is within the valid duration.

Furthermore, in the following embodiments, the actual state of a mobile station is appropriately considered. That is, as a specific state of a mobile station in EUTRA, isolated state, standby state and active state are conceivable.

Isolated state is a state in which the base station does not recognize the existence of the mobile station due to a reason such as that the mobile station has just been connected, or the mobile station has just transitioned to a RAT (Radio Access Technology) different.

Standby state means a state in which the base station recognizes the existence of the mobile station although data communication between the two has not yet taken place, the base station allocates a minimum resource for inputs to the mobile station, and the mobile station intermittently receives data through the resource allocated in this way.

Active state means a state in which the base station recognizes the existence of the mobile station, and data communication takes place between the base station and the mobile station.

With the foregoing in mind, embodiments of the present invention are specifically explained below.

(Embodiment 1)

Next, an embodiment 1 according to the present invention will be explained. Fig. 9 is a block diagram showing a configuration example of a mobile station. As shown in the figure, a mobile station 50 corresponds to EUTRA (using OFDM) and includes as a reception system an antenna AN1, a reception section 30, a channel demodulation section 32, a signal analysis section 34 control, a decoding section 36 and a channel measurement section 38, and as a transmission system an antenna AN2, a transmission section 40, a channel modulation section 42, a coding section 44, a planning section 46 and a transmission timing adjustment section 47. Furthermore, the operation of each section is integrally controlled by a control section 48, as a top layer.

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Next, the operation of the mobile station will be explained in Fig. 9. Through the antenna AN1 a signal is received from the base station by the reception section 30. The received signal is sent to the channel demodulation section 32 and the modulation process corresponding to the type or content of the channel is carried out. the received signal. Therefore, the received signal is modulated and transmitted to each of the processing sections (reference numerals 34 to 38) corresponding to the type of channel received.

That is, a control channel is transmitted to the control signal analysis section 34, a data channel is transmitted to the decoding section 36, and a measurement channel is transmitted to the channel measurement section 38. In this case, the control channel means the DSCCH, an announcement information channel or the like, the data channel means the DSDCH or the like, and the measurement channel means the D-CPICH or the like. The control signal analysis section 34 extracts control data, downlink channel information, transmission timing information, and scheduling information from the control channel.

The downlink channel information includes information necessary for decoding and modulation, and the downlink channel information is provided to the decoding section 36 and the channel demodulation section 32, respectively. In addition, the transmission timing information is transmitted to the transmission timing setting section 47. Additionally, planning information is transmitted to planning section 46.

The decoding section 36 takes user data from the data channel based on the downlink channel information. The channel measurement section 38 takes the measurement quality of the measurement channel. The control data, user data and the quality of the measurement are sent to the control section 48, as a top layer.

At the same time, after the transmission request from the control section 48 (upper layer), the user data and the control data are input into the encoding section 44 to be encoded. User data and control data encoded in this way are input to channel modulation section 42, to be modulated. The uplink channel information necessary to encode and modulate user data and control data is specified by planning section 46.

Furthermore, according to the planning information transmitted from the planning section 46, each transmission data is mapped to an appropriate uplink channel (RACH, USCCH, USDCH or the like). In addition, the transmission section 40 adjusts the transmission timing based on the correction information obtained from the transmission timing adjustment section, so that the transmission timing is synchronized with the reception timing at the base station. In this case, other configuration elements of the mobile station are not related to the present invention and therefore an explanation of them is omitted here.

Fig. 10 is a block diagram showing an example of a base station configuration. A base station 70 corresponds to EUTRA (using OFDM) and includes an antenna AN3, a reception section 72, a channel detection section 74, a planning section 76, a transmission timing information generation section 78, a downlink shared control channel (DSCCH) generation section 80 and a transmission section 82.

The channel detection section 74 detects a RACH (a synchronous RACH or an asynchronous RACH) or an uplink shared control channel (USCCH) from the received signal, and detects a request for transmission timing information and a resource allocation request from a mobile station. The scheduling section 76 generates scheduling information (resource allocation information) and the transmission timing information generation section 78 generates the transmission timing information (transmission timing correction information). The DSCCH generation section 80 configures a transmission frame that includes a DSCCH, and the transmission section 82 maps the scheduling information and transmission timing information on the DSCCH and transmits it to the mobile station from antenna AN3. .

Fig. 11 is a view showing an example of a series of procedures (and contents) of the uplink connection process between a mobile station and a base station. In Figure 11 the top row is a base station, where UL means an uplink line seen from the base station (a line from the base station to the mobile station) and DL means a downlink line seen from the base station. base station (a line from the mobile station to the base station). Also, the middle row of Figure 11 is a mobile station, where UL means an uplink line seen from the mobile station (a line from the mobile station to the base station) and DL means a downlink line seen. from the mobile station (a line from the base station to the mobile station). Also, the frame numbers in the bottom row of Figure 11 show serial numbers of the transmission frames. The same applies to the following figures.

ES 2 398 720 T3

The communication procedures of the connection process shown in Fig. 11 are preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request can be simultaneously included in one RACH transmission.

(2) USCCH includes a function to notify if transmission data exists and is used to request resource allocation.

(3) Synchronous RACH is not used.

At this time, the mobile station uses an asynchronous RACH for a transmission request (resource allocation request) from a state where there is no uplink resource information and the uplink is not synchronized and a state where no uplink resource information exists and the uplink is in sync. In addition, the mobile station uses one USCCH at a time, as long as the transmission data lasts for a transmission request from a state where uplink resource information exists and the uplink is synchronized.

Next, the transmission procedures of Figure 11 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because it is not an uplink resource is assigned. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

Transmission requests after the initial transmission are transmitted after the transmission timing information and scheduling information are received. That is, when there is uplink resource information and the uplink is synchronized, an uplink resource is assigned to the mobile station by the transmission timing information and the scheduling information and hence the utilization. of an asynchronous RACH that has the possibility of causing interference between other stations supposes a low efficiency of the use of the resource. Therefore, the USCCH is the most suitable for the transmission request (frames 6 and 11 in the figure). The mobile station follows the scheduling information reported from the base station via the DSCCH (frames 5 and 10 in the figure) and transmits data using the USDCH. In this case, the USCCH and the USDCH can be transmitted simultaneously.

The mobile station notifies the base station with information indicating that transmission data exists, as long as there is transmission data, and when there is no transmission data, it reports information indicating that there is no transmission data, each time it uses the USCCH. In this case, instead of notifying that there is no transmission data, the mobile station may implicitly notify the base station by failing to notify that there is transmission data.

Also, in case new transmission data is generated after all transmission data has been transmitted and before the uplink line is out of sync, i.e. there is no uplink resource information and the uplink line is synchronized, because no uplink resource has been allocated, USCCH cannot be used. Therefore, in this case, the asynchronous RACH is the most suitable (frame 21 in the figure).

Also, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not yet corrected, that is, when there is uplink resource information and the uplink is not synchronized, the USCCH cannot be used until timing information is received from the base station. Therefore, in such a case, an asynchronous RACH is the most suitable (frame 31 in the figure).

(Embodiment 2)

Next, Embodiment 2 according to the present invention will be explained. The configuration of a mobile station and a base station can be the same as in embodiment 1. Figure 12 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station. The communication procedures of the connection process shown in Fig. 12 are preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request can be simultaneously included in one RACH transmission.

(2) USCCH includes a function to report the volume of transmission data and is used to request the allocation of a resource.

ES 2 398 720 T3 (3) Synchronous RACH is not used.

At this time, the mobile station uses an asynchronous RACH for a transmission request from a state in which there is no uplink resource information and the uplink is not synchronized and a state in which there is no resource information. uplink and the uplink is synchronized. In addition, the mobile station uses a USCCH for a transmission request from a state in which uplink resource information exists and the uplink is synchronized when generating transmission data.

Next, the transmission procedures of Fig. 12 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because an uplink resource is not allocated. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

Transmission requests after the initial transmission are transmitted after the transmission timing information and scheduling information are received. That is, when the uplink resource information exists and the uplink is synchronized, an uplink resource is assigned to the mobile station by the transmission timing information and the scheduling information and hence the utilization. of an asynchronous RACH that has the possibility of causing interference between other stations, supposes a low efficiency of the use of a resource. Therefore, the USCCH is best suited for the transmission request (frames 6 and 14 in the figure). The mobile station includes the total volume of data to be transmitted on a USCCH, and transmits it as a transmission request only once (frame 6 in the figure). Furthermore, each time new transmission data is generated the mobile station includes the total volume of data to be transmitted on the USCCH and transmits it as a transmission request, only once (frame 14 in the figure). In a case other than the transmission request, the mobile station transmits data using the USDCH based on the scheduling information reported via the DSCCH from the base station (frames 10, 11 or the like). In this case, the USCCH and USDCH can be transmitted simultaneously at this time.

Additionally, in case new transmission data is generated after all transmission data has been transmitted and before the uplink line is out of sync, i.e. there is no uplink resource information and the uplink line is synchronous, because no uplink resource has been allocated, the USCCH cannot be used. Therefore, in this case, the asynchronous RACH is the most suitable (frame 21 in the figure).

Furthermore, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not corrected yet due to a cause such as a handover has just been carried out, that is, when uplink resource information exists and the uplink is not synchronized, the USCCH cannot be used until timing information is received from the base station. Therefore, in such a case, an asynchronous RACH is the most suitable (frame 31 in the figure).

(Embodiment 3)

Next, the embodiment 3 according to the present invention will be explained. The configuration of a mobile station can be the same as in embodiment 1. Figure 13 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station . The communication procedures shown in Fig. 13 are preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request cannot be simultaneously included in one RACH transmission.

(2) USCCH is not used to request the allocation of a resource.

(3) A synchronous RACH has the function of reporting the volume of transmission data, and is used for a resource allocation request.

At this time, the mobile station uses an asynchronous RACH for a transmission request (a resource allocation request) from a state where there is no uplink resource information and the uplink is not synchronized. Furthermore, the mobile station uses a synchronous RACH for a transmission request from a state where there is no uplink resource information and the uplink is synchronized. In this case, it is not necessary to take into account a state in which uplink resource information exists and the uplink is synchronized and a state in which uplink resource information exists and the uplink is not synchronized, under the conditions mentioned above.

ES 2 398 720 T3

Next, the transmission procedures of Fig. 13 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because an uplink resource is not allocated. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

The transmission request is transmitted after individually receiving transmission timing information. That is, when there is no uplink resource information and the uplink is synchronized, the uplink from the mobile station is corrected by the transmission timing information, and therefore the synchronous RACH is best suited for the transmission request (frames 6 and 12 in the figure).

The mobile station includes the data volume to be transmitted in a synchronous RACH, and transmits it only once (frame 6 in the figure). Since there is no allocation of a resource for the transmission request, the mobile station includes the volume of data to be transmitted in the synchronous RACH each time transmission data is generated, and transmits it only once (frame 12 in the figure) . In Fig. 13, it is shown that planning is carried out at the base station based on the total data volume a reported by frame 6, planning is carried out at the base station, the planning information is reported to the mobile station via the DSCCH (frame 10 in the figure) and data is transmitted via the USDCH based on the scheduling information (frame 11 in the figure).

In this case, in the present embodiment, USCCH is not used for the transmission request and there are no conditions where there is uplink resource information and the uplink is synchronized, and where there is link resource information. uplink and the uplink is out of sync. Therefore, it is not necessary for the mobile station to take into account the two conditions mentioned above.

In the present embodiment, because asynchronous RACH and synchronous RACH are used, how these two channels are mapped into a radio frame (communication resource) becomes a problem (i.e. how to carry out the mapping of channel).

Therefore, how to carry out channel mapping for synchronous / asynchronous RACH will be explained below. Figures 15 to 18 are views showing examples of synchronous / asynchronous RACH channel mapping. In this case, in each figure, an asynchronous RACH guard band is omitted. Furthermore, to simplify the drawings, the time axis of the synchronous RACH is depicted as occupying the entirety of 1 TTI. However, in reality, the synchronous RACH can be mapped to an arbitrary OFDM symbol and the number can be an arbitrary OFDM symbol within 1 TTI.

In Figure 15, the asynchronous RACH and the synchronous RACH are provided in different TTIs (subframe periods). Asynchronous RACH and synchronous RACH are mapped across the entire frequency bandwidth (BW) relative to the frequency axis, and are mapped at different TTIs relative to the time axis. In the figure, the synchronous RACH is arranged after the asynchronous RACH. However, the order can be reversed.

Furthermore, the RACHs can be provided in different frames and each of the RACHs can be provided continuously. In the present mapping method, it is possible to fixedly determine the transmission timing of each RACH in a frame period, and therefore there is an advantage that the reception process at the base station can be simplified.

In Figure 16, the asynchronous RACH and the synchronous RACH are provided in different frequency bands in the same TTI (subframe period). The asynchronous RACH and the synchronous RACH are mapped in the same TTI relative to the time axis. Furthermore, relative to the frequency axis, the synchronous RACH and the asynchronous RACH are arranged so that they do not overlap the frequency bandwidth of a resource unit (RU) (Bch) as a unit (i.e., the frequency bands differ while both channels are multiplexed into a common TTI).

In the present mapping method, both asynchronous / synchronous RACHs can be included in a common TTI and therefore it becomes possible to reduce the communication resource compared to the case of assigning each channel to different TTIs. That is, there is the advantage that by using the same resource used to assign only the asynchronous RACH to TTI, the assignment of both channels can be completed. In addition, depending on the frequency of use of each RACH, the division ratio of the frequency band is modified to allow a more efficient use of the resource. In addition, depending on the frequency of use of each RACH, the band assigned to each RACH is adaptively modified to allow a further improvement in the efficiency of resource use. For example, if the frequency of use of the synchronous RACH is high, the ratio of the asynchronous RACH and the synchronous RACH can be set, for example, to 4: 6, so that the collision probability is reduced when using synchronous RACH and efficiently uses the resource.

ES 2 398 720 T3

In Figure 17, the asynchronous RACH is provided in a TTI and the synchronous RACH is time shared by the unit of bandwidth (Bch) of a unit of resources to be provided. That is, the asynchronous RACH is provided in all frequency bands in a subframe period, and the synchronous RACH is time-shared to be provided in a frame period periodically over a series of subframe periods, while the frequency band it varies in the frequency band (Bch) of a resource unit, as a unit, so that the frequency bands in each subframe period do not overlap. In this case, the synchronous RACH may be provided in a continuous TTI, or it may be provided with an interval of a series of TTIs. However, the synchronous RACH must be provided homogeneously in one frame.

According to the mapping in figure 17, the synchronous RACH is provided homogeneously in the direction of the time axis, and therefore, when a data transmission request is generated by the synchronous RACH, it is possible to immediately map the synchronous RACH on a resource. (subcarrier) without a long waiting period. Therefore, there is a consequence that the delay of the process until the synchronous RACH is transmitted can be suppressed.

In Figure 18, the asynchronous RACH and the synchronous RACH are provided in the same TTI. Asynchronous RACH and synchronous RACH share the same frequency band and the same TTI. That is, both channels are provided in the same frequency band in the same subframe period. The synchronous RACH and the asynchronous RACH are temporarily shared in a subframe period, depending on whether it is necessary. Therefore, it is difficult to occupy a redundant resource. For example, an uplink resource occupied by the synchronous RACH is unnecessary.

In this case, the channel mapping method of Figures 15 to 18 can be predefined in the mobile communication system or can be specified for each cell by paging information from the base station. Furthermore, the channel mapping method shown in Figures 15 to 18 can be applied similarly to the following embodiments.

(Embodiment 4)

Next, Embodiment 4 according to the present invention is explained. The configuration of a mobile station and a base station can be the same as in embodiment 1. Figure 14 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station. The communication procedures shown in Fig. 14 are preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request cannot be simultaneously included in one RACH transmission.

(2) USCCH includes a function to report the volume of transmission data and is used to request the allocation of a resource.

(3) A synchronous RACH has the function of reporting the volume of transmission data, and is used for a resource allocation request.

At this time, the mobile station uses an asynchronous RACH for a transmission request from a state where there is no uplink resource information and the uplink is not synchronized. Furthermore, the mobile station uses a synchronous RACH for a transmission request from a state where there is no uplink resource information and the uplink is synchronized. Furthermore, the mobile station uses a USCCH for a transmission request from a state in which uplink resource information exists and the uplink is synchronized.

Next, the procedures of figure 14 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because it is not assigned. an uplink resource. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

The transmission request (resource allocation request) is transmitted after individually receiving transmission timing information. That is, when there is no uplink resource information and the uplink is synchronized, the uplink from the mobile station is corrected by the transmission timing information, and therefore the synchronous RACH is the most suitable ( plot 6 in the figure). The mobile station includes the data volume to be transmitted in a synchronous RACH and transmits it only once (frame 6 in the figure).

ES 2 398 720 T3

In addition, each time transmission data is generated, it is necessary to similarly notify the volume of data to be transmitted. However, at this time, because an uplink resource is allocated, it is not necessary to use the synchronous RACH. That is, in a state where there is uplink resource information and the uplink is synchronized, the USCCH is best suited for the transmission request (frame 12 in the figure).

The mobile station transmits data using the USDCH according to the scheduling information (frame 10 in the figure) reported by the DSCCH from the base station (frames 11 and 12). Then, each time new transmission data is generated, the data volume to be transmitted is included in the USCCH and transmitted only once. In this case, the USCCH and the USDCH can be transmitted simultaneously.

Furthermore, in case new transmission data is generated after all transmission data has been transmitted and before the uplink line is out of sync, i.e. there is no uplink resource information and the Uplink is synchronous, the USCCH cannot be used because there is no assigned uplink resource. Therefore, in this case, the synchronous RACH is the most suitable (frame 21 in the figure).

Additionally, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not being corrected yet due to a cause such as a handover has just been carried out. i.e. when there is uplink resource information and the uplink is out of sync, USCCH and synchronous RACH cannot be used until timing information is received from the base station. Therefore, in such a case, the asynchronous RACH is the most suitable (frame 31 in the figure).

Any of the methods shown in Figures 15 to 18 of Embodiment 3 can be used for channel mapping of the asynchronous RACH and the synchronous RACH of Embodiment 4.

(Embodiment 5)

Next, it will be explained in an embodiment 5 according to the present invention. The configuration of a mobile station and a base station can be the same as in embodiment 1. Figure 19 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station.

The communication methods shown in Fig. 19 are most suitable in a case where transmission data including a predetermined transmission interval and a fixed transmission rate (eg, verbal communication) is transmitted and is especially preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request cannot be simultaneously included in one RACH transmission.

(2) USCCH includes a function to notify data types and transmission speed, and is used to request the allocation of a resource.

(3) A synchronous RACH has a function of reporting data type and transmission speed, and is used for a resource allocation request.

At this time, the mobile station uses an asynchronous RACH for a transmission request from a state where there is no uplink resource information and the uplink is not synchronized. In addition, the mobile station uses the USCCH for a transmission request from a state in which uplink resource information exists and the uplink is synchronized. Also, a synchronous RACH is used for a transmission request from a state where there is no uplink resource information and the uplink is synchronized.

Next, the transmission procedures of Fig. 19 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because it is not an uplink resource is assigned. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

The transmission request is transmitted after individually receiving transmission timing information. That is, when there is no uplink resource information and the uplink is synchronized, the uplink from the mobile station is corrected by the transmission timing information, and therefore the synchronous RACH is best suited for the transmission request

ES 2 398 720 T3 (frame 6 in the figure). The mobile station includes data type and data transmission rate to be transmitted in a synchronous RACH, and transmits it only once (frame 6 in the figure).

Now, in a case where the data type includes a predetermined transmission interval and a fixed transmission rate, the base station performs scheduling to allocate an uplink resource by a predetermined interval, and reports scheduling information to the mobile station using the DSCCH (subframe 10 in the figure). The mobile station carries out the transmission using the uplink resource assigned in this way, with the predetermined interval, according to the scheduling information (frames 11 and 14 in the figure). Here, there may be a case where the base station allocates an uplink resource to the mobile station for transmission of a transmission request via the USCCH, and a case where the base station does not allocate an uplink resource. to the mobile station for transmission of a transmission request via the USCCH. Assigning an uplink resource allows a quick response to changes, such as increased traffic. However, if the transmission speed does not change, the allocation of a resource is wasted, and the reverse is also true. In connection with this, both cases will be described.

If there is an allocation of a resource for a transmission request, that is, if there is information of the uplink resource and the uplink is synchronized, the USCCH is the most suitable for the transmission request (frame 11 in the figure). In this case, the USCCH and USDCH can be transmitted simultaneously at this time. On the other hand, if there is no resource allocation for the transmission request, that is, there is no uplink resource information and the uplink is synchronized, the USCCH cannot be used because a link resource has not been allocated. upward. Therefore, the synchronous RACH is best suited for the transmission request (frame 21 in the figure).

Additionally, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not corrected yet due to a cause such as a handover has just been carried out, that is, when there is uplink resource information and the uplink is out of sync, USCCH and synchronous RACH cannot be used until timing information is received from the base station. Therefore, in such a case, the asynchronous RACH is the most suitable (frame 31 in the figure).

Any of the methods shown in Figures 15 to 18 of Embodiment 3 can be used for channel mapping of the asynchronous RACH and the synchronous RACH of Embodiment 5.

(Embodiment 6)

Next, an embodiment 6 according to the present invention will be explained. The configuration of a mobile station and a base station may be the same as in embodiment 1. Figure 20 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station. The conditions assumed in the communication procedures of Figure 20 are the same as in Embodiment 5. However, the methods of FIG. 20 are especially suitable for a case where the transmission data includes a predetermined transmission interval and a variable transmission rate (eg, variable bit rate video communication).

That is, according to the procedures of Fig. 20, the mobile station uses the asynchronous RACH for a transmission request from a state where there is no uplink resource information and the uplink is not synchronized. Furthermore, the mobile station uses the USCCH for a transmission request from a state in which uplink resource information exists and the uplink is synchronized. Also, the synchronous RACH is used for a transmission request from a state where there is no uplink resource information and the uplink is synchronized.

Next, the transmission procedures of Fig. 20 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because an uplink resource has not been allocated. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

The transmission request is transmitted after individually receiving transmission timing information. That is, when there is no uplink resource information and the uplink is synchronized, the uplink from the mobile station is corrected by the transmission timing information and therefore the synchronous RACH is the most suitable. for the transmission request (frame 6 in the figure).

The mobile station includes data type and transmission rate of the data to be transmitted in the synchronous RACH, and transmits it only once (frame 6 in the figure). Right now, in a case where the data type includes a

ES 2 398 720 T3 predetermined transmission interval and a variable transmission rate, the base station carries out scheduling to allocate an uplink resource by a predetermined interval, and notifies the scheduling information to the mobile station using the DSCCH (frame 10 in the figure). The mobile station carries out the transmission using the uplink resource thus allocated with the predetermined interval according to the scheduling information (frames 11 and 13 in the figure).

Here, there may be a case where the base station allocates an uplink resource to the mobile station for transmission of a transmission request via the USCCH, and a case where the base station does not allocate an uplink resource to the mobile station. mobile station for transmission of the transmission request via the USCCH. Assigning an uplink resource allows a quick response to changes such as increased traffic. However, if the transmission speed does not change, the allocation of a resource is wasted, and the reverse is also true. In connection with this, both cases will be described.

If there is an allocation of a resource for a transmission request, that is, if there is information of the uplink resource and the uplink is synchronized, the USCCH is the most suitable for the transmission request (frame 11 in the figure). In this case, the USCCH and USDCH can be transmitted simultaneously at this time. On the other hand, if there is no resource allocation for the transmission request, that is, there is no uplink resource information and the uplink is synchronized, the USCCH cannot be used because a transmission resource has not been allocated. uplink. Therefore, the synchronous RACH is best suited for the transmission request (frame 21 in the figure).

Additionally, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not corrected yet due to a cause such as a handover has just been carried out, that is, when there is uplink resource information and the uplink is out of sync, USCCH and synchronous RACH cannot be used until timing information is received from the base station. Therefore, in such a case, the asynchronous RACH is the most suitable (frame 31 in the figure).

Any of the methods shown in Figures 15 to 18 of Embodiment 3 can be used for channel mapping of the asynchronous RACH and the synchronous RACH of Embodiment 6.

(Embodiment 7)

Next, an embodiment 7 according to the present invention will be explained. The configuration of a mobile station and a base station can be the same as in embodiment 1. Figure 21 is another view showing an example of a series of procedures (and contents) of an uplink connection process between a mobile station and a base station. The communication procedures shown in Fig. 21 are preferable in a case where the following conditions (1) to (3) are satisfied.

(1) The RACH preamble and the transmission request cannot be simultaneously included in one RACH transmission.

(2) USCCH includes a function to report the volume of the non-transmitted data buffer of the mobile station, and is used to request the allocation of a resource.

(3) A synchronous RACH has a function of reporting the volume of the non-transmitted data buffer of the mobile station, and is used for a resource allocation request.

At this time, the mobile station uses the asynchronous RACH for a transmission request, from a state where there is no uplink resource information and the uplink is not synchronized. Furthermore, the mobile station uses the USCCH for a transmission request from a state in which uplink resource information exists and the uplink is synchronized. Also, the synchronous RACH is used for a transmission request from a state where there is no uplink resource information and the uplink is synchronized.

Next, the transmission procedures of Fig. 21 will be explained in detail. In the initial transmission, that is, when there is no uplink resource information and the uplink is not synchronized, the USCCH cannot be used because an uplink resource has not been allocated. Therefore, in the initial transmission, an asynchronous RACH is the most suitable (frame 1 in the figure).

The transmission request is transmitted after individually receiving transmission timing information. That is, when there is no uplink resource information and the uplink is synchronized, the uplink from the mobile station is corrected by the transmission timing information and therefore the synchronous RACH is best suited for the transmission request

ES 2 398 720 T3 (frame 6 in the figure). The mobile station includes the currently accumulated data buffer volume in a synchronous RACH, and transmits it as the first transmission request only once (frame 6 in the figure).

In figure 21, it is shown that the planning is carried out in the base station based on the volume B1 of the data buffer reported by frame 6, the planning information is notified to the mobile station by the DSCCH (frame 10 in the figure) and the data is transmitted over the USDCH based on the scheduling information (frame 11 in the figure).

The mobile station needs to report the data buffer volume each time, as a transmission request, after the first transmission request to the base station, until the data buffer volume is zero. However, since the allocation of an uplink resource is taking place at this time, it is not necessary to use the synchronous RACH. Therefore, in a case where there is uplink resource information and the uplink is synchronized, the USCCH is best suited for a different transmission request than the first transmission request (frame 11 in the figure). In this case, the USCCH and USDCH can be transmitted simultaneously at this time.

Also, in case new transmission data is generated after the data buffer volume becomes zero and before the uplink line is out of sync, i.e. there is no link resource information uplink and the uplink line is synchronous, the USCCH cannot be used because an uplink resource has not been allocated. Therefore, the asynchronous RACH is the most suitable at this time (frame 21 in the figure).

Additionally, in a state where the base station allocates an uplink resource to the mobile station but the transmission timing of the mobile station is not corrected yet due to a cause such as a handover has just been carried out, that is, when there is uplink resource information and the uplink is out of sync, USCCH and synchronous RACH cannot be used until timing information is received from the base station. Therefore, in such a case, the asynchronous RACH is the most suitable (frame 31 in the figure).

Any of the methods shown in Figures 15 to 18 of Embodiment 3 can be used for channel mapping of the asynchronous RACH and the synchronous RACH of Embodiment 7.

As described above, the embodiments of the present invention have been explained with reference to the figures. However, the present invention is not limited thereto and it should be understood that various changes and modifications can be made without departing from the scope and spirit of the present invention.

For example, the control channel used when the mobile station transmits a new resource allocation request to the base station, in a state where a resource has been allocated, is not always limited to the uplink shared control channel (USCCH ). Another control channel can be used as long as the channel can be commonly used by mobile stations and the channel can transmit information such as the type of data. In addition, depending on the state, a number of channels can be used selectively or simultaneously.

Furthermore, there may be a case where the adaptive use of the synchronous RACH / asynchronous RACH channel mapping method shown in Figures 15 to 18, depending on the state of the mobile station, improves the efficiency of using a resource. Furthermore, it is also conceivable that the TTI provision interval used for the allocation of the synchronous RACH or the asynchronous RACH is modified, depending on whether there are many subcarriers or a small number of subcarriers.

As explained above, according to the present invention, it is possible to achieve a new connection process between a mobile station and a base station, which can correspond flexibly to the actual state of the mobile station or to variations in transmission procedures. real, you can efficiently use a communication resource and it is compliant with the EUTRA standard.

That is, it is possible to clarify which communication channel should be used in each case in an uplink line connection process between a mobile station and a base station in EUTRA, taking into account globally the efficient use of a resource or the quality of the communication. Therefore, the most appropriate connection process can be achieved in the multi-carrier communication system of the EUTRA standard.

In addition, even if two types of information are transmitted (specifically, if the mobile station simultaneously transmits an uplink synchronization request and a resource allocation request), it is determined which channel is more suitable to use taking into account this case, and therefore a flexible correspondence can be achieved.

ES 2 398 720 T3

Furthermore, the efficient use of the synchronous RACH without guard time makes it possible to improve the efficiency of use of an OFDM communication resource and also makes it possible to eliminate the waste of a usable resource for data communication or the like, which is carried out simultaneously.

Furthermore, when the synchronous RACH / asynchronous RACH is mapped (assigned) to an OFDM communication resource regulated by a time axis and a frequency axis, various mapping methods are selectively used (i.e., subframe method, method division into frequency bands within a common subframe, method of homogeneously dispersing synchronous RACHs on a time axis with different frequency bands within a frame, method of assigning both RACHs to a common subframe), and mapping is used appropriately with wide variations to allow more efficient utilization of a resource.

According to the present invention, the content of a RACH sequence including an uplink connection process in EUTRA can be specifically and objectively regulated, and especially the most suitable EUTRA method of using the uplink channel can be provided.

As explained above, the present invention has an effect of achieving a new connection process between a mobile station and a base station, which can correspond flexibly to the actual state of the mobile station or to the variation of the procedure. real transmission, you can efficiently use the communication resource and follow the EUTRA standard. Therefore, the present invention is suitable as a connection processing method between a mobile station and a base station.